Johf b



(No Model.)

x J. B. OLDERSHAW.

HOT AIR FURNAUH' Fig.

I INVENTOR. I

ATTORNEY.

UNITED STATES ATEN'I JOHN B. OLDERSHAVV, OF BALTIMORE, MARYLAND.

HOT AIR' FURNACE.

SPECIFICATION forming part of Letters Patent No. 381,574, dated April 24, 1888.

Application filed June .20, 1887. Serial No. 241,827. (No model.)

To all whom it may concern: will be drawn directly into the annular air- Be it known that 1, JOHN B. OLDERSHAW, space L, where it is highly heated, and then a citizen of the United States, residing at Balpasses up into the closed top a of the hot-air timore, in the State of Maryland, have in jacket, and there mingles with the hot air, vented certain new and useful Improvements which, when in a cold condition, entered at 55 in Hot-Air Furnaces, of which the following the bottom 0 of the jacket. It will thus be is a specification. seen there are two supplies of cold air-the one This invention relates to a furnace for pro which enters at the bottom of the jacket, and duciug hot air, it being the object of the imthe other which enters midway between the provements comprising the invention to probottom and top at the inlets or pipes at. The 60 vide such construction as will furnish an inhot air in the closed top it passes out through creased supply of hot air without an increase the conveyersor pipes P, which will distribin the consumption of fuel. ute it to any desired point.

The invention is illustrated in the accom- Afurnace of given size thus constructed has panying drawings, in whichgreater capacity for producing hot air than 65 Figure l is a vertical section of the furnace. any construction I have heretofore seen. Fig. 2 is a View of the furnace-top. Fig. 3 is Having described my invention, I claim and a horizontal section on the line 3 3, showing desire to secure by Letters Patentofthe United the upper part. Fig. at is a plan taken on the States-- 2o lincet 4. Fig. 5 is a horizontal section on line 1. A hot-air furnace consisting of a grate, 7o 5 fire-pot, and combustionchanlber, a dome, G,

The letter A designates the fire-pot; b, the the hot-air chamber L, surrounding the dome, grate; A, the combustion-chambcr, and O a and an annular smokechamber, I, communijacket or case surrounding the fire-pot and eating with the combustion-chamber, a pipe,

combustionchamber and forming an inclosed j, connecting said dome and annular sinoke- 75 heating-space, D. A feed passage or chute, chamberand passing overchaniberL, a jacket,

6, leads from the jacket to the fire-pot, and is O, inclosing said chambers, dome, and the closed by a door, (2. The combustion-champot, and having openings near its base, achamher A or fire-pot has a top plate, F, with at her surrounding the fire-pot, annular chamcentral opening, G, and three slots or openher, and dome communicating with said hot- 80 lugs, h, concentric with said opening. Above air chamber L, the lateral pipes at, passing the central opening is a fire-dome, G, and an through jacket 6, chambers D and I, and conannularsmokechamber,I,surroundsthedome, nected with the chamber L, substantially as and the slots h, before mentioned, lead from specified.

the conibustionchamber A up into the annu- 2. The fire-p0t A, in combination with the 8 lar smoke-chamber I. The top of the the combustion-chamber A, having top wall, F, dome G and top of the annular smoke-chamwith openings G- h, the dome G, the annular berare connected by a smoke-pipe, j, and at a smoke-chamber I, the heating-chamber D, the point diametrically opposite that where the hot-air chamber L, the jacket 0, with open- 0 S id smoke pipeentersisasmoke fiue,K,which ings o, the pipe 9, connecting dome G and 90 leads to the chimney. chamber I, thelateral pipes m, passing through The above-described ce tral fire-dome, G, jacket 0, chambers D I, and communicating and annular smoke-chamber I are separated, with the hot-air chamber L, and the exit-flue so as to form between them an annular air- K, substantially as described.

5 space, L, open at its top, and which becomes In testimony whereof Iaflix my signature in 5 highly heated. I provide inlet passages or the presence of two witnesses.

P p which Open through the jacket 0 and JOHN B. OLDERSHAYV. pass through the airspace D and smoke cham- 'Witnesses: her I into the annular airspace L. By this Joan E. IVIORRIS,

construction and combination of parts the air JNO. T. MADDOX. 

